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No quack from MXR 120 envelope filter (Tonepad Agua filter)

Started by guile, July 01, 2016, 02:51:11 PM

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guile

I built the MXR 120 envelope filter (Tonepad): http://tonepad.com/getFile.asp?id=113

I have a dry guitar signal but no effect. I'm not doing any of the mods. Can anyone point out to me what I need to jumper (if any)?
Thanks in advance!

guile


Govmnt_Lacky

IC3 is supposed to be a CD4066..... you have a 4069 in there  :o

guile


Govmnt_Lacky

I also believe that you need to jumper E&F together as well as G&H together to get the stock circuit.

Good luck  ;D


guile

Many thanks Govmnt_Lacky.
Finally got the part, works great now. Feelin 'all seventies  8)

guile

Anyone know how to cure the huge volumedrop when engaged?

guile

Can anyone please take a look at the circuit and tell me what I could do to boost the effectsignal to unity gain?
Many thanks!

m-Kresol

you could try lowering R1 or increasing R2. They form filters with C2 and C4 though, so it might be you need to adjust those too.
I'd suggest going to 360-470k with R2 first and see how it sounds. Use sockets. Desoldering can be a pain.
I build pedals to hide my lousy playing.

My projects are labeled Quantum Effects. My shared OSH park projects: https://oshpark.com/profiles/m-Kresol
My build docs and tutorials